Enables clients to opt-in to state restoration by providing `restorationIdentifier` values for the Bottom Navigation controller's child view controllers.
Closes#8265
This test ensures that the `additionalSafeAreaInsets` property of child VCs is
correctly set to account for the bottom navigation bar.
Confirmation of #8112
The `MDCBottomNavigationBarController` was incorrectly only adding its child
view controllers as "proper" child view controllers when they became the
selected view controller. This resulted in difficulties when attempting to
perform state restoration within apps with the controller as the root view
controller.
Closes#7984
Observes the navigation bar's items property and if at anytime the new items do not equal the view controllers' tab bar items an exception will be thrown.
Closes#6785
Instead of having separate `/beta` file paths for beta code, the beta files
can be excluded from CocoaPods. Also adding targets to bazel since it was trying to compile all of the source files (and failing).
Part of #4160
